A tale of shifting relations: East Asian summer and winter monsoon variability during the Holocene

Kaboth‐Bahr, Stefanie; Bahr, André; Zeeden, Christian; Yamoah, Kweku Afrifa; Lone, Mahjoor Ahmad; Chuang, Chih-Kai; Löwemark, Ludvig; Wei, Kuo-Yen

doi:10.1038/s41598-021-85444-7

Cited by 24 publications

(9 citation statements)

References 46 publications

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“…Over Europe, millennial-scale variability decreases inland along the path of prevailing winds blowing from the Atlantic Ocean, and is lowest over Fennoscandia (Finland and Scandinavia), where blocking events are most frequent 43 . Similarly, China's high millennial variability is linked to variability in the East Asian Summer Monsoon 44 , and further north in eastern Siberia the dominant westerlies bring little oceanic influence. This further suggests that higher millennial variability relies on higher connectivity to oceans, as implied by EBMs, although compounded by local sensitivity.…”

Section: Land-temperature Variability From Pollen Recordsmentioning

confidence: 99%

Millennial-scale climate variability over land overprinted by ocean temperature fluctuations

Hébert

Herzschuh²,

Laepple³

2022

Nat. Geosci.

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Variations in regional temperature have widespread implications for society, but our understanding of the amplitude and origin of long-term natural variability is insufficient for accurate regional projections. This is especially the case for terrestrial temperature variability, which is currently thought to be weak over long timescales. By performing spectral analysis on climate reconstructions, produced using sedimentary pollen records from the Northern Hemisphere over the last 8,000 years, coupled with instrumental data, we provide a comprehensive estimate of regional temperature variability from annual to millennial timescales. We show that short-term random variations are overprinted by strong ocean-driven climate variability on multi-decadal and longer timescales. This may cause substantial and potentially unpredictable regional climatic shifts in the coming century, in contrast to the relatively muted and homogeneous warming projected by climate models. Due to the marine influence, regions characterized by stable oceanic climate at sub-decadal timescales experience stronger long-term variability, and continental regions with higher sub-decadal variability show weaker long-term variability. This fundamental relationship between the timescales provides a unique insight into the emergence of a marine-driven low-frequency regime governing terrestrial climate variability and sets the basis to project the amplitude of temperature fluctuations on multi-decadal timescales and longer.

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Section: Land-temperature Variability From Pollen Recordsmentioning

confidence: 99%

Millennial-scale climate variability over land overprinted by ocean temperature fluctuations

Hébert

Herzschuh²,

Laepple³

2022

Nat. Geosci.

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“…granulata in the euphotic zone (Lund, 1954;Nakano et al, 1996;Petrova, 1986) rather than A. veraluciae. Moreover, multiproxy hydroclimate records in Vietnam and Laos, which show synchronised enhanced summer and winter monsoon precipitation between 8000 and 6000 cal BP (Kaboth-Bahr et al, 2021;Wolf, 2022), potentially encouraged the summer destratification in Biển Hồ. Further, a relatively weak phase of EAWM in Southern China recorded near the end of the Early Holocene and during an interval of from 8000 to 7000 cal BP (Figure 6) (Wang et al, 2012), was possibly related to the limitation of the intensity of water-mixing in the euphotic zone in Biển Hồ lake during winter seasons, leading to the persistence of A. granulata var.…”

Section: The Environmental Regime Shift (7800 Cal Bp)mentioning

confidence: 99%

“…Numerous studies on climate patterns in the Southeast Asian region, particularly in Vietnam, have highlighted the complexity that arises when multiple monsoon subsystems operate concurrently within a specific geographical area (Buckley et al, 2014; Kaboth-Bahr et al, 2021; Wang and Lin, 2002; Wolf et al, 2023). The Central Highlands of Vietnam lies at the convergence point of three summer monsoon subsystems: the Indian Summer Monsoon (ISM), the East Asian Summer Monsoon (EASM), and the Northwest Pacific Summer Monsoon (NPSM) (Buckley et al, 2014; Wang and Lin, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…The NWM, after traversing the South China Sea, is a substantial moisture source for Vietnam (Wolf et al, 2023). The evolution of the summer and winter monsoon subsystems has grown progressively complex and diverse due to ongoing climate change since the Late Pleistocene and anthropogenic global warming (Li et al, 2014; Kaboth-Bahr et al, 2021; Wolf, 2022). These mechanisms have given rise to extreme climatic events, including droughts in the Central Highlands already in the past (Nguyễn-Đình et al, 2022), and also leading to significant agricultural losses with profound socio-economic repercussions on local communities in modern times (Asia-CRCiS, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Diatom-based indications of an environmental regime shift and droughts associated with seasonal monsoons during the Holocene in Biển Hồ maar lake, the Central Highlands, Vietnam

Đào-Trung,

Fukumoto,

Nguyễn-Thùy

et al. 2024

The Holocene

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The interactions of the different monsoon systems across Southeast Asia create extreme climate phenomena. Central Vietnam, located near the centre of this transitional region, has encountered numerous effects. As a result, its sediments from lakes or speleothems are valuable archives for interpreting past climate variability. However, there is still a lack of high-resolution paleoenvironmental and palaeoclimatic reconstructions during the Holocene in Vietnam. Our study presents a paleoenvironmental diatom-based record of sediment cores collected from Biển Hồ maar lake (14°03′N, 108°00′E) in the Central Highlands of Vietnam covering nearly the entire Holocene. Based on changes in diatom assemblages in the sediment sequence, we identified two periods of the Early Holocene (~11,700–7800 cal BP) and the Mid- to Late-Holocene (~7800–360 cal BP), which mark a remarkable shift in the environment around Biển Hồ. Alternations of key diatom species during the Early Holocene indicate intensity variations between water-mixing and thermal stratification mechanisms in meso-eutrophic conditions. During the Mid- to Late-Holocene, the complete dominance of Aulacoseira granulata var. granulata implies year-round destratification and intense mixing of the lake water column in a permanently eutrophic environment. Its morphological variability reveals intervals of dry environmental conditions driven by pronounced droughts across the Asian continent.

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“…Surface warming triggers an enhanced rise of warm air masses over the Asian continent. It invokes a strong transport of clean water vapor masses from the oceans into the interior of the Asian continent [48] and thus contributes to a decreased AOD [49]. Especially in summer and autumn, anthropogenic aerosols, which play a dominant role in East Asia, are an important factor in the weakening of the summer monsoon (July to September) in recent decades.…”

Section: Intra-annual Variations Of Aodmentioning

confidence: 99%

Spatial-Temporal Variation of AOD Based on MAIAC AOD in East Asia from 2011 to 2020

et al. 2022

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In recent years, atmospheric aerosol pollution has seriously affected the ecological environment and human health. Understanding the spatial and temporal variation of AOD is essential to revealing the impact of aerosols on the environment. Based on the MAIAC AOD 1 km product from 2011 to 2020, we analyzed AOD’s distribution patterns and trends in different time series across East Asia. The results showed that: (1) The annual average AOD in East Asia varied between 0.203 and 0.246, with a decrease of 14.029%. The areas with high AOD values were mainly located in the North China Plain area, the Sichuan Basin area, and the Ganges Delta area, with 0.497, 0.514, and 0.527, respectively. Low AOD values were mainly found in the Tibetan Plateau and in mountainous areas north of 40° N, with 0.061 in the Tibetan Plateau area. (2) The distribution of AOD showed a logarithmic decreasing trend with increasing altitude. Meanwhile, the lower the altitude, the faster the rate of AOD changes with altitude. (3) The AOD of East Asia showed different variations in characteristics in different seasons. The maximum, minimum, and mean values of AOD in spring and summer were much higher than those in autumn and winter. The monthly average AOD reached a maximum of 0.326 in March and a minimum of 0.190 in November. The AOD showed a continuous downward trend from March to September. The highest quarterly AOD values in the North China Plain occurred in summer, while the highest quarterly AOD values in the Sichuan Basin, the Ganges Delta, and the Tibetan Plateau all occurred in spring, similar to the overall seasonal variation in East Asia.

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A tale of shifting relations: East Asian summer and winter monsoon variability during the Holocene

Cited by 24 publications

References 46 publications

Millennial-scale climate variability over land overprinted by ocean temperature fluctuations

Millennial-scale climate variability over land overprinted by ocean temperature fluctuations

Diatom-based indications of an environmental regime shift and droughts associated with seasonal monsoons during the Holocene in Biển Hồ maar lake, the Central Highlands, Vietnam

Spatial-Temporal Variation of AOD Based on MAIAC AOD in East Asia from 2011 to 2020

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